Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1af4aed00a056b…

MALICIOUS

PDF

76.2 KB Created: 2021-09-13 11:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f58612a1f66a85c64c06dc768ff44cb7 SHA-1: 9c703b1b01548a63ea6aa38d9098db5d9a07bbc2 SHA-256: ef1af4aed00a056b8cb8727a123e8847a698fdf6996f6365bfc6be02e5a8755a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to external URLs, such as the observed 'https://crysiq.ru/uplcv?utm_term=music+arrow+fnf+game+apk', which are often used for phishing or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crysiq.ru/uplcv?utm_term=music+arrow+fnf+game+apk PDF link annotation
    • http://amsasecretariat.fr/userfiles/file/60125452334.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/gevosumetesutaraxaw.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/pilisas.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/zigejemekavujowesov.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/koxunilafa.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/womozupob.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/10171051677.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/mufarat.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/simufe.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/fevojixowavuj.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/84911740942.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/42421566640.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/wadota.pdfIn PDF document text
    • https://amgaa.org/temp/files/tubexafezepuxeji.pdfIn PDF document text
    • http://erex.hu/upload/file/46019378145.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/samevi.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/50837073978.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/wigodavobijurevezitino.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210912_5B03955B54204755.pdfIn PDF document text
    • http://domario.ru/userfiles/file/94260442360.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/62817234370.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a429ddc570---mopavimof.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/petomavupuwano.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/34179932794.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/suvutijaxakovasebujan.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3A 10952 bytes
SHA-256: 00e87441d17e16a2ec7bb68c050ea23b86b30adc4d5e99b149b638593ea4d79f
font_02_sfnt_off0000f4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B1 17768 bytes
SHA-256: 9fb82dffbd0bc2d5a73b36d2e3808c7351346ecbb5a28b01f0e83263f56eb509